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首页> 美国政府科技报告 >Superrotation Planetary Atmospheres: Mechanical Analogy, Angular Momentum Budget and Simulation of the Spin Up Process
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Superrotation Planetary Atmospheres: Mechanical Analogy, Angular Momentum Budget and Simulation of the Spin Up Process

机译：超旋转行星气氛：机械类比，角动量预算和旋转过程模拟

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Superrotation rates observed in planetary atmospheres are analyzed based on the concept of a thermally driven zonally symmetric circulation. Specifically, how this superrotation is produced and maintained against the tendency for friction to oppose differential motions between the atmosphere and the underlying planet is addressed. The time evolution of a fluid leading from corotation under uniform heating to superrotation under globally nonuniform heating is simulated using a three dimensional zonally symmetric spectral model and Laplace transformation. The increased tendency toward geostrophy combined with the increase of surface pressure toward the poles (due to meridional mass transport), induces the atmosphere to subrotate temporarily at lower altitudes. The resulting viscous shear near the surface thus permits angular momentum to flow from the planet into the atmosphere where it propagates upwards and, combined with the change in moment of inertia, produces large superrotation rates at higher viscosities.

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